XeLED-1UV-R-375 + XeLED-1IR-950-I
Uses 1*AAA battery each. UV is $30, IR is $60, sold as a pair for $90.
Light Therapy pens, one 950nm infrared and one 375nm ultraviolet. Each pen is a rugged aluminum, with a solid tailcap click on/off switch, and a pocket clip. Because 950nm is invisble to the human eye, the infrared version features an off-axis red indicator light visible from the tip (and off to the side) to allow the user to tell if the light is on and functioning.
DATASHEET
375nm Device emits UV radiation. Do not look directly at beam. Keep out of reach of children.